Coupling rub-impact dynamics of double translational joints with subsidence for time-varying load in a planar mechanical system

Xiao, Shungen; Liu, Shulin; Song, Mengmeng; Ang, Nie; Zhang, Hongli

doi:10.1007/s11044-019-09718-9

Cited by 46 publications

(26 citation statements)

References 39 publications

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“…Therefore, the ankle dorsi-flexors act as an energy absorber in the eccentric phase, whereas the plantar-flexors act as an energy generator in the concentric phase that increases the vertical COM velocity throughout the takeoff phase [6]. The ankle joint is important in transmitting the force generated through the joints and other body parts to the ground [28]. This suggests that the jumper should exert a plantar-flexion moment in the early stages such that the positive work is larger during the concentric phase and the negative work duration is shorter.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical Characteristics of Single Leg Jump in Collegiate Basketball Players Based on Approach Technique

et al. 2019

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Our study investigated the characteristics of the biomechanics of lower extremities during running single leg jump (RSJ) in collegiate basketball players. Twelve division III male basketball players voluntarily participated in this study. They performed three trials of the running single leg jump with two approach speeds (fast and preferred) randomly. The kinematic data were collected by motion analysis system (200 Hz), and kinetic data were collected using the AMTI force platform (1000 Hz), and electromyography (EMG) data were recorded by the Delsys surface Electromyography (EMG) system (2000 Hz). Kinematic, kinetic and EMG signal were synchronized using EvaRT 4.6. Peak Ground reaction force, eccentric loading rate (ELR), gastrocnemius (GA) of pre-activation phase, and tibialis anterior (TA) of push-off phase were found significantly larger in the fast approach speed (p < 0.05). RSJ improves muscle activation level and stretch reflex. Higher activation of TA and GA during RSJ may have the benefit of decreasing risk of injury and jump training. Thus, it is helpful in muscle stretch adaptation.

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Section: Discussionmentioning

confidence: 99%

Biomechanical Characteristics of Single Leg Jump in Collegiate Basketball Players Based on Approach Technique

et al. 2019

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“…1–3 During the wave breaking process, the motion of wave surface dynamically coupled with the air involvement, which formed a gas-liquid mixture and the gas content was large. 4–6 When the jet hit the water, air was sucked into water. 7–9 In other words, under the action of wave breaking, bow wave and jet, bubbles were formed in water.…”

Section: Introductionmentioning

confidence: 99%

Reducing bubble generation and sweepdown effect on a research vessel with a moonpool

Yao

Huang

Shi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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Some research vessels set moonpools for sonars installation. The moonpool provides a relatively good working environment for sonar in a harsh marine environment. At the same time, other acoustic detection equipment are installed along the ship bottom behind the moonpool. Due to the exist of the sonar with a variable cross-section, the number of bubbles generated in the moonpool increases. The bubbles generated in the moonpool expel and flow along the vessel bottom to the stern, which leads to the sweepdown effect. The performance of the sonar and other acoustic detection equipment degrades by the bubbles around. However, the research on reducing bubble generation in the moonpool and sweepdown effects is rare. So in present paper the reduction effects of damping devices such as the flange and choke deck on the bubble generation in the moonpool are investigated experimentally. Then, in order to reduce the sweepdown effects of bubbles on the ship bottom, three other damping devices which are double flaps, diversion channel and wedge are investigated. It can be seen that through reducing the area of bubble leakage in the moonpool the distribution position of bubbles can be effectively restricted and the width and thickness of the bubbles reduce.

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“…Most objects of the research studies on the shear layer oscillation were aerodynamic cavity instead of the moonpool [19][20][21][22][23]. e shear oscillation was studied by visual methods such as laser Doppler velocity measurement (LDA) and particle image velocimetry (PIV) [24][25][26]. e shear layer oscillation often occurred in an unbounded jet, a cavity flow, a bluff body flow, and so on [27,28].…”

Section: Introductionmentioning

confidence: 99%

Research on Oscillating Characteristics of the Shear Layer on the Ship Bottom with a Moonpool under the Action of the Current and Wave

Huang

Yao

Shi

et al. 2021

Mathematical Problems in Engineering

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For some research vessels, a sonar is installed in the moonpool, and some acoustic detection equipment are installed on the ship bottom behind the moonpool, which helps to avoid the impact of the high-speed flow. The moonpool causes the ship bottom discontinued, forming a particular shear layer oscillation. The shear layer oscillation affects the bubble generation and motion in and behind the moonpool. The sonar and acoustic equipment will malfunction when surrounded by many bubbles. However, there is almost no research on the shear layer oscillation near the moonpool. So, in this paper, by measuring the pressure near the moonpool and monitoring the fluid motion in the moonpool and bubbles’ distribution along the ship bottom, the shear layer oscillation near the moonpool is studied experimentally under the action of the incident current and wave. Furthermore, the effects of the sonar and the moonpool shape are investigated. It can be seen that the shear layer oscillation excites the fluid motion in the moonpool. The sonar forms a complicated boundary in the moonpool, resulting in the increase in the frequency of the shear layer oscillation. The shear layer propagates along the ship bottom in the form of the ship bottom wave. Clarifying the oscillating characteristics of the shear layer along the ship bottom with a moonpool is conducive to the design of moonpools in the research ships, and the detection instruments are arranged in the right place along the ship bottom, so as to make sure the detection instruments work properly and detect the marine environment more accurately.

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Coupling rub-impact dynamics of double translational joints with subsidence for time-varying load in a planar mechanical system

Cited by 46 publications

References 39 publications

Biomechanical Characteristics of Single Leg Jump in Collegiate Basketball Players Based on Approach Technique

Biomechanical Characteristics of Single Leg Jump in Collegiate Basketball Players Based on Approach Technique

Reducing bubble generation and sweepdown effect on a research vessel with a moonpool

Research on Oscillating Characteristics of the Shear Layer on the Ship Bottom with a Moonpool under the Action of the Current and Wave

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